<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="css/common.css">
  <link rel="stylesheet" href="css/login.css">
  <title>注册页面</title>
</head>
<body>
<!-- 导航栏 -->
<div class="nav">网页聊天

</div>
<div class="login-container">
  <div class="login-dialog">
    <h3>注册</h3>
    <div class="row">
      <span>用户名</span>
      <input type="text" id="username">
    </div>
    <div class="row">
      <span>密码</span>
      <input type="password" id="password">
    </div>
    <div class="row">
      <button id="submit">注册</button>
    </div>
  </div>
</div>
<!-- 引入 jquery -->
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<!-- 实现前后端交互 -->
<script>
  let submitButton = document.querySelector('#submit');
  submitButton.onclick = function() {
    // 1. 获取到用户输入的用户名和密码
    let username = document.querySelector('#username').value;
    let password = document.querySelector('#password').value;
    if (username == '' || password == '') {
      alert('您输入的用户名或密码为空!');
      return;
    }

    // 2. 发送 ajax 请求
    $.ajax({
      type: 'post',
      url: 'register',
      data: {
        username: username,
        password: password
      },
      success: function(body) {
        if (body && body.userId > 0) {
          alert('注册成功!');
          location.assign('/login.html');
        } else {
          alert('注册失败!');
        }
      }
    });
  }
</script>
</body>
</html>